Mister Exam

2x^2+y^2-4xy-4xyz canonical form

The teacher will be very surprised to see your correct solution 😉

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 2      2                      
y  + 2*x  - 4*x*y - 4*x*y*z = 0
$$2 x^{2} - 4 x y z - 4 x y + y^{2} = 0$$
2*x^2 - 4*x*y*z - 4*x*y + y^2 = 0